error: future cannot be sent between threads safely
  --> $DIR/issue-65436-raw-ptr-not-send.rs:12:5
   |
LL | fn assert_send<T: Send>(_: T) {}
   |                   ---- required by this bound in `assert_send`
...
LL |     assert_send(async {
   |     ^^^^^^^^^^^ future returned by `main` is not `Send`
   |
   = help: within `impl std::future::Future`, the trait `std::marker::Send` is not implemented for `*const u8`
note: future is not `Send` as this value is used across an await
  --> $DIR/issue-65436-raw-ptr-not-send.rs:14:9
   |
LL |         bar(Foo(std::ptr::null())).await;
   |         ^^^^^^^^----------------^^^^^^^^- `std::ptr::null()` is later dropped here
   |         |       |
   |         |       has type `*const u8`
   |         await occurs here, with `std::ptr::null()` maybe used later
help: consider moving this into a `let` binding to create a shorter lived borrow
  --> $DIR/issue-65436-raw-ptr-not-send.rs:14:13
   |
LL |         bar(Foo(std::ptr::null())).await;
   |             ^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error